Feeding mechanism for rock drills



A H. v. HAIGHT FEEDING MECHANISM FOR ROCK DRILLS Filed July 2, 11:23-

liiill IIIIIII m5 ATT'o NEY Patented May 26, 1925,4

UNITED y STATES PATENT OFFICE'.

'HARRY v. HAiGHT, or sHEEBEooKEoUEBEC. CANADA, AssrofNoE Torno-Eason! EAN13 COMPANY, 0E JERSEY CITY,\NEW JERSEY, A CORPORATION or NEW JEnsEY.

FEEDING MECHANISM FOR ROCK DRILLS.

y.Application filed July 2,

To all whom t may concern.' i Y Be it known that I, HARRY V. HAIGHT, a citizen of the Dominion lof' Canada, and a resident of Sherbrooke, Province of Quebec, Canada, have invented a lcertain Feeding Mechanism for Rock Drills, of which the following is a specication, accompanied by drawings. i y This invention relates to rock drills lout more particularly to the feeding means of a stope drill.

One of the main objects of the invention is to enable the packing in the feed piston of a stope drill to be automatically forced tightr ly against the feed cylinder in-,accordance with the pressure in the feed cylinder', `so that the packing always remains tight.

Another object of the invention is to produce a piston having relatively movable parts, between which a packingis located, and adapted to be pressed against the feed cylinder in accordance with the pressure 1n the lfeed cylinder. i f

. Further objects of the invention will here` inafter appear, and the invention, is illustrated in one of its preferred 'forms in the drawings, in which i Figure 1 is a side elevation partly in vertical section of a stope drill, which has been selected as an example of' a rock drillto which the invention may be applied,

Figure 2 is a fragmentary detail vertical sectional view of' a modified form of the invention, and j Figure 3 is a similar view of a further modification of the invention. i

Referring to the drawings, the stope drill has the cylinder A, to which is secured the front head B by the usual side bolts C and in which fronthead the drill steel Dy extends for receiving the impact blows ofthe ham-` mer piston. The cylinder A is separated from the feed cylinder E by the head block F, to which is secured the usual rotation handle Gr for manually rotating the drill steel D. Motive fluid is admitted to the machine through the inlet H and is controlled by the usual throttle valve having a handle J.

In accordance with my invention, the feed piston K comprises the cylindrical cap piece L and a cup shaped hollow main head O. The cap L is adapted to have limited longitudinal movement in the main head O and the body portion of the cap is guided in the 1923. S,eria19N0.G49,083.

cup shaped cavity by the walls of the head.k The cup L is provided with a flange at its outer end which, with the head O and the towhich is secured, as by the rivet R, thev usualfeed piston rod S, carrying the usual rock engaging pointer Tat its lower end. A guide bolt U is provided'in this instance with an enlarged neck or "portion U', forming a shoulder U2 adapted to bearagainst the capL. The head V of the bolt is rectangular and located in the projection Q and the shank of the bolt is passed through the mainpiston head O, cap L and the washer WV, and is secured by the nut g so that the shoulder U2 is drawn against the cap, and the cap and bolt are firmly held together. Aspring X preferably in the form of a split ring, surrounds the washer W and is adapted to cooperate with the bushing Y for locking the piston and piston rod in its extreme inward position in the feed cylinder E. rIlhe head V of the bolt in Figure 1 has limited longitudinal movement between the rivetk R and mainhead O, which forms stops for the `bol-t head V, and the bolt cannot turn.

' As, pressure fluid is admitted-to the feed cylinder through the passage J, the cap L is forced downwardly, and presses the packing` I? tightly againsti the cylinder. The greater the pressure within the cylinder, the more tightly will thepacking P be forced against the cylinder, thus preventing leak-` age of pressure fluid from the cylinder, so -that the machine is held in the desired work` ing position. j

In the modification shown in Figure 2, the projection Q, of the main head O is formed with the longitudinal grooves a and o and the enlarged portion or neck U of' the bolt U is provided with a rivet c, having an enlarged head e.` In the assembly of the parts, the enlarged rivet head c is first moved downwardly in the groove@ until it passes the end of the projection Q, and is then turned and moved upwardly in the second groove b, which only extends a short distance in the main head O. A rivet f is then inlill serted to hold the piston rod S and the washer WV of the main head O together, and also to serve the additional purpose of preventing the bolt U from dropping out, should its nut g become loose.

In the modification shown in Figure 8, the feed piston rod S is formed with an integral main head r having a groove through which the enlarged head rivet 0 may be passed and then turned about and moved up within the main head, kas shown. A stop member p is secured to the piston rod S and prevents the bolt U from falling out.

I claim:

l. A fluid pressure piston, comprising ay cup shaped main hollow piston head, a cylindrical cap havinglimited. longitudinal movement in said hollow head, the body portion of said cap being guided in the head cavity by the walls of the head, said cap having a flange at its outer end, packing material in the recess formed between the said cap flange and the main head, a guide bolt having an enlarged neck forming a shoulder, a bolt shank passing through the said cap, and means for rigidly securing the bolt in the cap, the neck of the bolt extendingv inwardly intol the main piston head, stops on the main piston head, and a stop on the bolt neck cooperating with said stops on the main piston head for limiting the longitudinal movement of the bolt and cap relatively to the main piston head.

2. A fluid pressure piston, comprising a cup shaped mainhollow piston head, a cylindrical cap having limited longitudinal movement in said hollow head, the body portion of said cap being guided in the head cavity by the walls of the head, said cap having a flange at its outer end, packing material in the recess formed between the said cap flange and the main head, a guide vbolt rigidly secured in the cap and having` an enlarged portion extending inwardly -into the main piston head, stops cooperating with said enlarged portion of the bolt for limiting' the longitudinal inovementof the bolt and cap relatively tothe main piston head, and means for preventing the bolt from turning on its own axis.

3. A fluid pressure piston, comprising ar cup shaped main hollow piston head, a cy- 'c ofthe lindrical cap having limited longitudinal movement in said hollow head, the body portion of said cap being guided in the head cavity by the walls of the head, said cap having a flange at its outer end, packing material in the recess formed between the said cap vflange and the main head, a guide bolt having an enlarged neck forming a shoulder, a bolt shank passing through the said cap, and means for rigidly securing the bolt in the cap, 'the neck of' the bolt extending inwardly into. the main piston head, stops on the main piston head, a -stop on the bolt neck cooperating with said stops on the main piston head vfor limiting the longitudinal movement ofthe bolt and cap relativelyto the main piston head, and means also cooperating with the stop on the bolt neck for preventing the bolt from turning on its own axis. l

4. A fluid pressure piston, comprising a cup shaped main hollow piston head, a cylindricaly cap having limited longitudinal movement in said hollow head, the body portion of said cap being guided in the head cavity by the walls of the head, said cap having a flange at its outer end, packing material in the recess `formed between the said cap flangeand the main head, a guide forming a part ofthe cap and extending inwardly from lthe-.body portion of said cap into the main piston head, and stops cooperating with said guide for limiting the longitudinal movement of the guide and cap relativelyto the main piston head.

5. A piston for use in fluid pressure feeding mechanism for rock drills adapted to slide within a feed cylinder comprising, a main head, having a hollow projecting end, a cap,`paeking material between saidcap and said head, a bolt extending through said cap into said hollow end, a groove extending the length of said hollow projecting end and a second shorter groove whereby the bolt is adapted to be inserted through the first said groove and Vturned and held in the second shorter groove, and means for limiting the longitudinal movement of said cap and bolt with respect to said main head.

In testimony whereof I vhave signed this specification,

HARRY V. HAIGH'I. 

